This is an odd one, because the faster cards tend to have some minor frame time spikes to about 30 ms. You can see it in the plots. The GTX 780 and Titan suffer the most, but the 290X also participates in this problem. Seems like the cards with the highest frame rates are the most affected.

Nevertheless, the GTX 780 just edges out the R9 290X across multiple metrics for a rare outright performance win.